20877560 has 64 divisors (see below), whose sum is σ = 53498880. Its totient is φ = 7258240.

The previous prime is 20877559. The next prime is 20877587. The reversal of 20877560 is 6577802.

It is a self number, because there is not a number n which added to its sum of digits gives 20877560.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9089 + ... + 11151.

It is an arithmetic number, because the mean of its divisors is an integer number (835920).

Almost surely, 2^20877560 is an apocalyptic number.

20877560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20877560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26749440).

20877560 is an abundant number, since it is smaller than the sum of its proper divisors (32621320).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20877560 is a wasteful number, since it uses less digits than its factorization.

20877560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 20877560 is about 4569.1968659711. The cubic root of 20877560 is about 275.3551774352.

The spelling of 20877560 in words is "twenty million, eight hundred seventy-seven thousand, five hundred sixty".